I might go to a shop, but I'm not going to fiddle around with a screwdriver and a YouTube video for something manufacturers themsleves let you do in 5 seconds.

However, that does not leave me with workable alternatives. I respect what Fairphone is trying to do, but €500 for a replaceable battery phone with internals several years old isn't the right choice for me.

That was likely true of models from the mid-2010s, but based on what I've seen of Hugh Jeffrey's work, most modern, high-end smartphones are held together with glue and require the disconnection of multiple fragile ribbon cables to replace the battery. It's a daunting task even for someone with experience working on computer components.

It depends on the phone. Some are constructed with glue as well as screws, or have plastic tabs that become brittle and can easily break when servicing the phone.